Answer:
The answer is (x + 3) (x - 7) = 0
Step-by-step explanation:
x² - 4x = 21
x² - 4x - 21 = 0
x² - 7x + 3x - 21 = 0
x(x - 7) + 3(x - 7) = 0
(x + 3) (x - 7) = 0
Thus, The answer is (x + 3) (x - 7) = 0
<em><u>-TheUnknownScientist</u></em>
Substitute -2 in for x and get (9)^-2
Flip the equation so that the exponent is positive and get 1/9^2
Work it out 1/(9*9) = 1/81
I believe the answer is 1 1/2 / minute
Y = 7x + 12
-7y = x + 56
-7y = x + 56
-7 -7
y = ⁻¹/₇ - 8
The following lines are perpendicular.
Answer:
2.25 or 2 1/4 pounds
Step-by-step explanation:
We need to find the weight of the food and water. To do this, find the difference between his backpack before the food and water and after. His backpack without the food is 7 3/4 pounds, and his backpack after is 11 3/4 pounds.
11 3/4 - 7 3/4
4
The food and water together weigh 4 pounds. We know the water weighs 1 3/4 pounds, so we can subtract it from the total to find what the food weighs.
4- 1 3/4
2 1/4
As a decimal: 2.25
The food weighs 2 1/4 or 2.25 pounds